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Audio
Engineering Society
Chicago SectionMeeting Recap - December 6, 2012
AES
Chicago Section Meeting Notice
TOPIC:
Perceptual
Implications of Data Compressed Audio
PRESENTER:
Dr. Pantelis
N. Vassilakis
DATE:
Tuesday, December 6,
2011
TIME:
7:30pm; dinner (optional) at 6:30pm
LOCATION:
Shure Incorporated, 5800 W. Touhy Ave,
Niles, IL 60714 ABOUT THE PRESENTATION:
The
dual objective of audio data compression algorithms is to reduce
the digital file size of audio content for more efficient storage
and distribution without audibly altering its quality, as
perceived by listeners. The mathematical and psycho-acoustical
bases of the relevant algorithms guarantee that, save for simple
audio programming (i.e. with narrow bandwidth, dynamic range, and
spatial spread and with limited/coarse time variance), audio data
compression resulting in 128, 192, and even 256kb/sec data rates
will audibly alter the signal in question and irreversibly remove
physical aspects usually associated with perceived naturalness and
complexity. Exclusive exposure to data compressed audio may
deprive listeners from opportunities to be exposed to and
therefore stay "trained" in their ability to decipher
sonic micro variations that are essential not only to a rich
musical experience but to communication in general. Several ways
to address this potential problem will be addressed, leading to a
discussion of if/how sound signal micro-variation considerations
may inform sound recording/mixing decisions.
ABOUT
THIS MONTH’S SPEAKER:
Pantelis
N. Vassilakis earned a Post Doctoral Certificate in Auditory
Science (2003) from the University of California – Los Angeles
(UCLA), Ph.D (2001) and M.A. (1997) degrees in Ethnomusicology,
specializing in music cognition, acoustics, and aesthetics, also
from UCLA, and a B.A. degree in Music Composition and Technology
(1993) from Kingston University, Surrey, England. He has also
completed course studies in Electrical Engineering at the National
Polytechnic of Athens, Greece.
Dr.
Vassilakis has composed for the English National Ballet and the
London Chinese Orchestra, has sound designed for BBC Radio 3, the
London Greek Radio, and the Greek Theater Company in London UK, is
routinely hired to digitally restore and master commercial and
educational recordings, and has extensive experience as a live and
studio musician, sound engineer, and producer.
Since
1997, he has been presenting at US national and international
conferences, often as an invited speaker, publishing several
abstracts, articles, and book chapters and serving as reviewer for
publications that include the Journal of the Acoustical Society of
America, the Journal of Comparative Physiology, the Computer Music
Journal, and Oxford University Press. His work has been cited by
over seventy research studies and his recently published signal
analysis and processing tool is being utilized in research labs
around the world. Pantelis is currently the Chairman of the Audio
Arts + Acoustics Department, Columbia College Chicago.
http://www.colum.edu/aaa
http://acousticslab.org
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